The fascia of the diaphragm is a fairly large muscle, in some cases up to 39.7 cm, covering the lower part of the abdominal wall behind the uterus and rectum. However, its function is to stabilize the uterus in the position of a woman in labor. This muscle attaches the diaphragm to the lower abdomen. The blood supply to the lower fascia comes from the vascular system of the pelvis. The inferior fascia is a well-developed round muscle. It is what connects the vagina to the pelvic diaphragm and prevents the pelvic organs from descending towards the rectum. The inferior fascia is also called the circular fascia.